The two spent a lot of time together during the event and one onlooker saw them share a kiss under a blanket

The royal and Anything Could Happen singer have also been swapping regular flirty texts in recent weeks.

A source close to Harry’s social circle said: “He has told friends how much he likes Ellie and she is clearly taken by him.”

Harry, 31, and Ellie, 29, have been friends for ­several years, growing close after she performed at brother William’s wedding.
She was at the closing ceremony for Harry’s Invictus Games in 2014. And they were “all over each other” after the polo at Coworth Park, Berks.

According to an onlooker, Harry and Ellie "only had eyes for each other all night" at the polo club event

“It turned into a real party late into the night and there was a complete ban on taking pictures so Harry and the other celebrities there could feel comfortable.

“Harry was really going for it after the polo - he was drinking and dancing.

“They were part of a wider group including Tom Hardy.

“But Harry and Ellie only had eyes for each other all night – they spent a lot of time sitting together under blankets.

“They were seen having a kiss before Harry had to go because he was playing polo the next day. Ellie left about five minutes later.

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“Harry was overheard on the way out telling some friends how much he liked her.

“But there’s already a lot of talk amongst friends that the palace wouldn’t allow her as a serious girlfriend because of her celebrity background.”

Society magazine Tatler described the event as a “riot of fun” attended by a “chino-wearing, summer dress-clad crowd”.

The posh mag added: “Everyone was suitably sloshed (thanks to being plied with espresso martinis since their arrival).”

Ellie - one of Britain’s most successful popstars - has close links to the royals having performed for them on more than one occasion.

Harry and Ellie hug backstage at the Invictus Games closing ceremony in 2014

She stunned guests at Kate and William’s wedding in 2011 and said previously of the Duke and Duchess of Cambridge: “I’m friends with them, so it’s not like it’s awkward because I don’t know them. So that’s fine.”

She was also asked to perform at Prince Harry’s 30th birthday party in September.

And in 2014 she wowed Wills and Kate at the Royal Variety Show in a 600ft dress as she sang How Long Will I Love You and Explosion.

Both stars have had mixed love lives.

Ellie’s most serious boyfriend was McFly bassist Dougie Poynter - with whom she had talked about marrying. But they split earlier this year.

Before that she dated Radio 1 host Greg James for a year and a half - before brief flings with One Direction star Niall Horan and chart-topper Ed Sheeran.

The royal and singer have also been swapping flirty texts in recent weeks

Harry’s most serious relationship was with Zimbabwean-born Chelsy Davy, who he had an on-off six year relationship with until 2010.

He then quietly started dating aspiring actress Cressida Bonas in 2012, but they broke up after two years after an argument about attending best pal Guy Pelly’s wedding.

After the split the royal was seen cosying up to Doctor Who actress Jenna, whose ex boyfriend is Game of Thrones star Richard Madden.